A small, handy thread passport. Made of impact-resistant plastic, hooks on both ends, tube level made of Plexiglas. The cotton pass is hung on a thread that is tightened between two points, so the height difference between the points can be checked.
Characteristics
- Made of ABS plastic, the cotton passport is both light and durable.
- Tube vials are made of plexiglass.
- The dragonfly fluid is a light-moving colored oil mixture that allows the bubble to move very well.